1. 7th Department of Pneumonology, Hospital for Diseases of the Chest, “Sotiria”, Athens, Greece
2. 2nd Department of respiratory Medicine, National and Kapodistrian University of Athens, Attikon Hospital, Athens, Greece
3. First Academic Department of Pneumonology, Interstitial Lung Diseases Unit, Hospital for Diseases of the Chest, “Sotiria”, Medical School, National and Kapodistrian University of Athens, Athens, Greece